Renesas R5F5631WDDFC#V0

Overview

R5F5631WDDFC#V0 from Renesas is a 100 MHz 32-bit RX CPU-based microcontroller in the RX631 Group, featuring 1 MB on-chip flash memory, 192 KB SRAM, 32 KB data flash, integrated 12-bit and 10-bit A/D converters (21 and 8 channels), dual 10-bit D/A outputs, Ethernet MAC (not present - RX631 excludes Ethernet), USB 2.0 full-speed host/function interface, CAN v2.0B (2 channels), and real-time clock with battery backup. It targets industrial HMI and networked sensor nodes requiring deterministic timing and mixed-signal control.

For engineers reviewing the R5F5631WDDFC#V0 datasheet, R5F5631WDDFC#V0 pinout, R5F5631WDDFC#V0 application, or R5F5631WDDFC#V0 equivalent, key selection criteria include its 176-pin LQFP (PLQP0176KB-A) package, -40 to +85°C operating range (D version), absence of Ethernet controller, support for up to 134 GPIOs with 5-V tolerance, and compatibility with Renesas E1/E20 debug interfaces.

Technical Context

The R5F5631WDDFC#V0 implements the RXv1 CPU core with Harvard architecture, 5-stage pipeline, and IEEE-754 single-precision FPU delivering 165 DMIPS at 100 MHz. It supports little-endian data and instruction ordering, includes MPU for memory protection, and features JTAG/FINE debugging interfaces.

Its peripheral set omits Ethernet (distinguishing it from RX63N), but retains USB 2.0 host/function/OTG, three CAN channels (though only two enabled per package constraints), 13 SCI channels (with LIN and smart-card modes), four I²C interfaces (one FM+), and parallel data capture unit (PDC) for image sensor interfacing in selected packages.

Key Specifications

Pinout & Package

Package: PLQP0176KB-A - 176-pin LQFP, 24 × 24 mm body, 0.5 mm pitch, exposed pad (thermal pad not electrically connected).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microcontroller applications.

Compared with R5F5631WDDFC#V0, the RX63N alternative adds Ethernet at higher cost and complexity, while the RX66T offers superior motor-control peripherals but sacrifices communication flexibility - making R5F5631WDDFC#V0 optimal for balanced mixed-signal, multi-protocol embedded control without Ethernet.

Availability

R5F5631WDDFC#V0 is available at Aetrix Electronics and suitable for industrial HMI, smart energy metering, HVAC control, and factory automation gateways requiring stable component supply, long-term lifecycle assurance, and automotive-grade reliability under extended temperature operation.

Supply support for R5F5631WDDFC#V0 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Renesas Electronics is a global semiconductor leader specializing in microcontrollers, analog, power, and SoC solutions for industrial, automotive, and infrastructure markets.

The RX631 Group is designed for cost-sensitive, high-integration embedded applications demanding real-time performance, rich analog peripherals, and multiple industry-standard communication interfaces - without Ethernet overhead.

FAQ

Does R5F5631WDDFC#V0 include an Ethernet MAC?

No, R5F5631WDDFC#V0 belongs to the RX631 Group, which explicitly excludes the Ethernet MAC and associated EDMAC peripheral. This distinguishes it from the RX63N Group (e.g., R5F563NEDDFC#V0). The R5F5631WDDFC#V0 supports USB 2.0, CAN, SCI, I²C, and RSPI instead - making it suitable for applications where wired Ethernet is unnecessary or implemented externally.

What is the maximum flash size supported by R5F5631WDDFC#V0?

R5F5631WDDFC#V0 is configured with 1 MB of on-chip flash memory, as confirmed by Renesas documentation and part number decoding. It operates at 100 MHz with zero wait states, enabling deterministic code execution. Larger flash variants (e.g., 2 MB) exist in the RX631 family but are assigned distinct part numbers such as R5F563NFDDFC#V0.

Which debug interfaces does R5F5631WDDFC#V0 support?

R5F5631WDDFC#V0 supports both JTAG and Renesas' two-wire FINE (Fast IN-Circuit Emulator) interfaces. These are compatible with the E1 and E20 debug emulators. FINE reduces pin count requirements versus full JTAG, enabling debugging on space-constrained boards while maintaining real-time trace and breakpoint capabilities.

Is the R5F5631WDDFC#V0 pin-compatible with other RX631 Group LQFP-176 variants?

Yes, all RX631 Group parts in the PLQP0176KB-A package - including R5F5631WDDFC#V0, R5F563NECDFC#V0, and R5F563NJDDFC#V0 - share identical pinouts and mechanical footprint. Functional differences (e.g., flash size, SRAM capacity, peripheral enablement) are implemented internally and do not affect board layout or interconnect design.

What is the purpose of the VBATT pin on R5F5631WDDFC#V0?

The VBATT pin on R5F5631WDDFC#V0 supplies backup power to the real-time clock (RTC) and optional backup RAM registers during main power loss. It accepts 2.0–3.6 V and enables continuous timekeeping and critical state retention - essential for energy meters, alarm systems, and industrial loggers requiring timestamp accuracy across power cycles.